This number includes the Pixel smartphones and the Pixel 2 released near the end of 2017.

Jeronimo points out how it’s a “remarkable achievement to double sales,” especially during a time when consumers mostly already have smartphones. Apple shipped nearly 14 million units in the company’s first year, but that was ten years ago when there were fewer smartphones on the market.

Jeronimo also says 3.9 million units is only a tiny portion of the 1.5 billion market size.